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x in (-oo:+oo)
(6/3)*x = 3*15 // - 3*15
(6/3)*x-(3*15) = 0
(6/3)*x-45 = 0
2*x-45 = 0 // + 45
2*x = 45 // : 2
x = 45/2
x = 45/2
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